What is chatgpt-apps?

A development guide for ChatGPT Apps SDK applications, which combine a server that provides tools with an interface shown inside ChatGPT. It covers tool registration, the MCP connection, widget interfaces, metadata, security settings, and deployment preparation.

Building, scaffolding, refactoring, or troubleshooting ChatGPT apps with an MCP server and widget UI.

It helps developers follow the current structure and connection rules needed for a ChatGPT app to work reliably and be tested or submitted.

chatgpt-apps — Skill for Codex by seaworld008

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add seaworld008/Commonly-used-high-value-skills --skill chatgpt-apps

Clone the repo

git clone --depth 1 https://github.com/seaworld008/Commonly-used-high-value-skills

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/chatgpt-apps/github.svg)](https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/chatgpt-apps)

Your own site

<a href="https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/chatgpt-apps"><img src="https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/chatgpt-apps/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/seaworld008/commonly-used-high-value-skills/chatgpt-apps"><img src="https://agentmods.dev/badge/skills/seaworld008/commonly-used-high-value-skills/chatgpt-apps.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,335 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 91% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00036	$0.04335
Opus 5	$0.00018	$0.02167
Sonnet 5	$0.00007	$0.00867
Haiku 4.5	$0.00004	$0.00434

Measured 5d ago against content hash 908da9aa354c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

chatgpt-apps scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/scaffold_node_ext_apps.mjs), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

91% identical to chatgpt-apps — 41 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

openclaw-skills/chatgpt-apps/SKILL.md · 352 lines

How it starts

The opening of the file, as written. The whole thing — 352 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ChatGPT Apps

When to Use

Use this skill when the user wants to:

build a ChatGPT app with an MCP server and widget UI
scaffold or refactor an Apps SDK project
register tools, UI resources, or bridge wiring for ChatGPT
prepare a local app for developer-mode testing or public submission

Usage

Recommended flow:

fetch current OpenAI docs
-> classify app archetype
-> plan tools before code
-> choose an example or scaffold
-> implement server and widget
-> validate local loop and deploy path

Overview

Scaffold ChatGPT Apps SDK implementations with a docs-first, example-first workflow, then generate code that follows current Apps SDK and MCP Apps bridge patterns.

Use this skill to produce:

A primary app-archetype classification and repo-shape decision
A tool plan (names, schemas, annotations, outputs)
An upstream starting-point recommendation (official example, ext-apps example, or local fallback scaffold)
An MCP server scaffold (resource registration, tool handlers, metadata)
A widget scaffold (MCP Apps bridge first, window.openai compatibility/extensions second)
A reusable Node + @modelcontextprotocol/ext-apps starter scaffold for low-dependency fallbacks
A validation report against the minimum working repo contract
Local dev and connector setup steps
A short stakeholder summary of what the app does (when requested)

Mandatory Docs-First Workflow

Use $openai-docs first whenever building or changing a ChatGPT Apps SDK app.

Invoke $openai-docs (preferred) or call the OpenAI docs MCP server directly.
Fetch current Apps SDK docs before writing code, especially (baseline pages):
- apps-sdk/build/mcp-server
- apps-sdk/build/chatgpt-ui
- apps-sdk/build/examples
- apps-sdk/plan/tools
- apps-sdk/reference
Fetch apps-sdk/quickstart when scaffolding a new app or generating a first-pass implementation, and check the official examples repo/page before inventing a scaffold from scratch.
Fetch deployment/submission docs when the task includes local ChatGPT testing, hosting, or public launch:
- apps-sdk/deploy
- apps-sdk/deploy/submission
- apps-sdk/app-submission-guidelines
Cite the docs URLs you used when explaining design choices or generated scaffolds.
Prefer current docs guidance over older repo patterns when they differ, and call out compatibility aliases explicitly.
If doc search times out or returns poor matches, fetch the canonical Apps SDK pages directly by URL and continue; do not let search failure block scaffolding.

Read the full file on GitHub · 352 lines

Files

What ships with it

10 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

5d ago Changed · -59 tokens per session 908da9aa354c
12d ago First seen · 352 lines · 95 tokens per session scan A 3d26dfc609f2

Subscribe to this mod's changes

chatgpt-apps is a skill published in the GitHub repository seaworld008/Commonly-used-high-value-skills (70 stars, last pushed 5d ago), licensed MIT. It adds 36 tokens to every session and 4,335 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 91% identical to chatgpt-apps, differing in 41 lines, and is treated as a copy.

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chatgpt-apps